The effects of metal oxide additions or dopants on the electrical performance of AgSnO/sub 2/ contact materials

Electrical Contacts - 2007 Proceedings of the 53rd IEEE Holm Conference on Electrical Contacts Pub Date : 1993-09-27 DOI:10.1109/HOLM.1993.489660

D. Jeannot, J. Pinard, P. Ramoni, E. Jost

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引用次数: 12

Abstract

The new contact material AgSnO/sub 2/, which is replacing AgCdO in many applications, requires the addition of doping agents to improve electrical contact performance. These additions effect thermodynamic stability, wettability of the SnO/sub 2/ surface by liquid silver as well as the microstructure of the area melted by the electric arc. This work considers the frequently used dopants WO/sub 3/, MoO/sub 3/, Bi/sub 2/O/sub 3/, CuO and RuO/sub 2/ as well as others: ZnO, Ta/sub 2/O/sub 5/, HgO, RuO/sub 2/, Sb/sub 2/O/sub 3/, TeO/sub 2/ and TaC. DTA and TGA analyses are performed on mixtures of these metal oxides with SnO/sub 2/, Ag and AgSnO/sub 2/. Reaction products, if present, are characterized by X-ray diffraction. The wetting angles of molten silver on surfaces of these mixtures are established. The results are used to interpret the microstructures found in the molten regions of AgSnO/sub 2/ materials doped with these substances. These structures are interpreted and related to performance in arcing contact applications.

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金属氧化物的添加或掺杂对AgSnO/ sub2 /触点材料电性能的影响

新的接触材料AgSnO/ sub2 /在许多应用中取代AgCdO，需要添加掺杂剂来改善电接触性能。这些添加剂影响了SnO/sub /表面的热力学稳定性、液银的润湿性以及电弧熔化区域的微观结构。本文研究了常用的掺杂剂WO/sub 3/、MoO/sub 3/、Bi/sub 2/O/sub 3/、CuO和RuO/sub 2/以及其他掺杂剂:ZnO、Ta/sub 2/O/sub 5/、HgO、RuO/sub 2/、Sb/sub 2/O/sub 3/、TeO/sub 2/和TaC。对这些金属氧化物与SnO/ sub2 /、Ag和AgSnO/ sub2 /的混合物进行了差热分析和热重分析。如果有反应产物，则用x射线衍射进行表征。确定了银液在这些混合物表面的润湿角。结果用于解释掺入这些物质的AgSnO/ sub2 /材料熔融区域的微观结构。这些结构被解释并与电弧接触应用中的性能有关。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Electrical Contacts - 2007 Proceedings of the 53rd IEEE Holm Conference on Electrical Contacts

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